once a hero, lance armstrong is now by his own admission a liar. the cancer survivor built his mythic image on seven consecutive victories in the tour de france and vehement denials that his success was helped by performance-enhancing drugs. >> have you ever, ever, in the history of this race, used performance-enhancing drugs? >> absolutely not. never. not once. >> how many times do i have to say it? >> we have nothing to hide. >> i have never doped. >> nobody believes in doping controls more than me. >> reporter: when he sat down with oprah winfrey yesterday, armstrong admitted he doped. a source with knowledge of the interview described it as awkward and tense. winfrey called it difficult. >> emotional doesn't begin to describe the intensity or the difficulty that, i think, he experienced in talking about some of these things. >> reporter: betsy, once part of armstrong's inner circle with her husband, a former teammate, is one of armstrong's most vocal critics. >> there were a lot of people he hurt and a lot of people he tried to destroy. >> repo